VaYera

But God said to Abraham, 'Do not be troubled because of the boy and your slave. Do everything that Sarah tells you. It is through Isaac that you will gain posterity.Vayomer Elohim el-Avraham al-yera be'eyneycha al-hana'ar ve'al-amatecha kol asher tomar eleycha Sarah shma bekolah ki beYitschak yikare lecha zara.

21:13

But still, I will also make the slave's son into a nation, for he is your child.'Vegam et-ben-ha'amah legoy asimenu ki zar'acha hu.

Commentary:

gain posterity Literally, 'you will be said to have offspring,' or, 'offspring will be considered yours.'

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